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package com.earth2me.essentials.anticheat.data;
import com.earth2me.essentials.anticheat.actions.Action;
import java.util.HashMap;
import java.util.Map;
/**
* Store amount of action executions for last 60 seconds for various actions
*
*/
public class ExecutionHistory
{
private static class ExecutionHistoryEntry
{
private final int executionTimes[];
private long lastExecution = 0;
private int totalEntries = 0;
private long lastClearedTime = 0;
private ExecutionHistoryEntry(int monitoredTimeFrame)
{
this.executionTimes = new int[monitoredTimeFrame];
}
/**
* Remember an execution at the specific time
*/
private void addCounter(long time)
{
// clear out now outdated values from the array
if (time - lastClearedTime > 0)
{
// Clear the next few fields of the array
clearTimes(lastClearedTime + 1, time - lastClearedTime);
lastClearedTime = time + 1;
}
executionTimes[(int)(time % executionTimes.length)]++;
totalEntries++;
}
/**
* Clean parts of the array
*
* @param start
* @param length
*/
private void clearTimes(long start, long length)
{
if (length <= 0)
{
return; // nothing to do (yet)
}
if (length > executionTimes.length)
{
length = executionTimes.length;
}
int j = (int)start % executionTimes.length;
for (int i = 0; i < length; i++)
{
if (j == executionTimes.length)
{
j = 0;
}
totalEntries -= executionTimes[j];
executionTimes[j] = 0;
j++;
}
}
public int getCounter()
{
return totalEntries;
}
public long getLastExecution()
{
return lastExecution;
}
public void setLastExecution(long time)
{
this.lastExecution = time;
}
}
// Store data between Events
// time + action + action-counter
private final Map<String, Map<Action, ExecutionHistoryEntry>> executionHistories;
public ExecutionHistory()
{
executionHistories = new HashMap<String, Map<Action, ExecutionHistoryEntry>>();
}
/**
* Returns true, if the action should be executed, because all time criteria have been met. Will add a entry with
* the time to a list which will influence further requests, so only use once and remember the result
*
* @param check
* @param action
* @param time a time IN SECONDS
* @return
*/
public boolean executeAction(String check, Action action, long time)
{
Map<Action, ExecutionHistoryEntry> executionHistory = executionHistories.get(check);
if (executionHistory == null)
{
executionHistory = new HashMap<Action, ExecutionHistoryEntry>();
executionHistories.put(check, executionHistory);
}
ExecutionHistoryEntry entry = executionHistory.get(action);
if (entry == null)
{
entry = new ExecutionHistoryEntry(60);
executionHistory.put(action, entry);
}
// update entry
entry.addCounter(time);
if (entry.getCounter() > action.delay)
{
// Execute action?
if (entry.getLastExecution() <= time - action.repeat)
{
// Execute action!
entry.setLastExecution(time);
return true;
}
}
return false;
}
}
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